Pfizer's bivalent Covid booster could increase the risk of a stroke in recipients over age 65, officials report. Centers for Disease Control and Prevention (CDC) officials cited vaccine safety database data that showed an increased risk of ischemic stroke in the elderly within three weeks of getting the shot. An ischemic stroke, also known as brain ischemia, is caused by blockages in arteries that carry blood to the brain. The safety concern requires more investigation and 'the totality of the data currently suggests that it is very unlikely that the signal … represents a true clinical risk', CDC wrote in...
